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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecc8b10e0e29d36f2a8f76d886be20f66f9c3a9e1958f4268ea1fa228359038' 
  AND token = '1BFcCMshkIWcRo7d+hOGWTyVYJg0/l7Q1qCs+iDvs0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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