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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4b786fe34c4a4d22447f4acb557fcb68b0936e50eee8b00ecc98603e48e4ff' 
  AND token = 'eKJxPDpL0aLsYi9PxLbs7Nwo8QKD/G8kGtN4RYN7k8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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