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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc24ff79a0e302e450abc1424eae0517fbdad9a81f3a5cde52bde6cc9cda81f' 
  AND token = '+tmnEdmlY/UhoPh2nZ81hRzyKOPA84z8tu+XPvQLuDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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