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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c346b87d1a191d3d5b5455923b1b2cdbd45b1a95706d9b37eaec0b2a860419' 
  AND token = 'kiP2ixgz0U6MYJ4R6iz3+1h9gnb3Tx6oDaR83it+v9U=' 
  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"
    }
  }
}