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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f43a1fd8b565e031a48a6c784c85b582ec3790f85c5b7f343afbfc07f8b1e7' 
  AND token = 'U5xzXNegYRKxlVuE73WrBGJzmH5AbFZpGVOHHFtSc7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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