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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c583b35da083b4654206a4f841816df8f2d2552dc62441ee454fc1630629d31' 
  AND token = '6cNWK7YG3ESEpi59WygISJjwQtE9Pr2A+NcUzp1WW2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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