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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663640d5d4c7dd8484cc551571c8b97f50e7d39fa2ea9f15f3fc5df154c8abc6' 
  AND token = 'i4zJm1oK2ngtYQYhdoOLL7a1CY86EuGMY4VMZXJrz4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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