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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be0930d3a55083e4a895aa46e7d2540018bfd1ff7f454237a8609448a1878aa' 
  AND token = 'yzy+ezfWs5ooG5R0Z31nQ2Nf2Zz/NPtc1G6CvDluMIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}