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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38642b16184b1b77dea5f6c95a5e873b24b146e766fa5e9a271d9e9ffbe2f75' 
  AND token = 'w/MoNxBWLarlW6FbQOlFhCKzWMtEnzUAp4KQ/i16dkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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