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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5d3c388de72679118437cb61c80b2d5a4279472fa8b96574b92c738367b17b' 
  AND token = 'e7M6y3JuVX0065K926IHimKNZkNS2SolwrqA44lTPJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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