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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45cc5c0b43dc1dba8b5b6da42fa57d092324cb04d7a7162cbf561be093dba1ef' 
  AND token = 'GrSuv4B+INtH6gC+mR2Ejq1YKy+DcmH6Q5UD0WLNJHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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