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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbdad356a1754cf297b9616475f17676ca96a5dc85a4b0f460c6a1db132d262' 
  AND token = 'PDGPWjUkY8OVGXoaCPI7+3HdFiUIGMwXW6bqcS5r58E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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