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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6259c8e2d920ba558a51b523834bf57dc7756cd567822d6f87d0893d94ee90f0' 
  AND token = '6M+D7s2Mc0zF3hMBTv+NQZu66fO+3QHx1VchyFS2h1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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