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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98640a0273939746d186f92af5589bf1d81b6e4335f9807e730f9ae3e68a91ab' 
  AND token = 'vv8cCgb4CoQ6MSFVV03ZRU9ARbHYwI5iO2Boe/BbdYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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