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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c764218336d704ea16be7bea2c1725b0fc5cbc24ae55d38c69c17fdb9870c5' 
  AND token = 'GoDVEfO+yC9puxZ9wif1E8sv1lAcBiOev+8yJi7EsfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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