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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe85ed8dfa47265a8beb25857f0bcf192bdb0d4844dab7d5317416dadd29adb' 
  AND token = 'drYdLc0GJLW/8C/Eb29axFyNToYAEo7Hc7fNvAETqCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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