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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b978bb588e3ba96577c953a35c1bc29f821e7fab7cb4b6c1a03b0a0991f798d' 
  AND token = 'kI111Pt9xN0/Q9/UA3SShfTWg5yPSoA5nWIB/7ycF1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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