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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f39ae62d2627e1768b1b75fea95b4b44cec0dd9b238d7c527ef36700d8c535' 
  AND token = 'NtQtEzX6nXmWSbMZOgUn6VRu5VGT99vN+UdmslVl+t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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