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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bfc24b485b47ec2b7ff0bd41cd46c8e47a6bf6a72d29c7319b5f583fc99da9' 
  AND token = 'oFKAJ7oBUVkbyx2HgGbvb0ixrxyuzdDoqG0+ESMa6ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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