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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de5ca39a1bbb5cddc2b1c0707c25172b61309c01e36c66e390f9c215f6d03a9' 
  AND token = 'pc/vsVq7aMYAXgn45Iq4RVJbEUdXGy+fe2UNNJHbLrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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