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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2870927061c03f9d8a92911775c4597ddc32c443c6abea477e8af60ff251ed25' 
  AND token = 'ypl6G1CHAqQURWkzrzpMrtZu7rUyuhSECqc2k27w+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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