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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37fd387d60671a47aa76e778dde6cbb48459d85ccbd995f08e1d7706753cb334' 
  AND token = 'Ayf0OcR0VOfjvz2ZYSvCPKiQpAR8smJSfTMh/bl1kF8=' 
  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"
    }
  }
}