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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfc309e180c91517d034cb4c4c06dc2a7d4f52f07cfc29014f2402f2e190591' 
  AND token = 'gUxa+mmgNWUaJpAxDzhHHPmEjsL96EPKBumM4zX3VHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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