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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7453f8466d49f9b4f65b40374dba3d00d49f784640d80ff6c12a8eea2c924139' 
  AND token = 'VJ/cCW85Vt10cjbj2tMHpJWNrljhootLm3vXXIHlk9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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