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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aaf4e1cbb8f7f6655331a8da70b97c2a8bb447084e13bf6520f22e200c82e9a' 
  AND token = '7oNJdsc/qR1QDjaAW+uh0V1qSEVO8To9wruPuwSu9/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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