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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a872c417b31a05e8071478559da528d06e4b9f5cd55d825b4a0678319fcfb40' 
  AND token = '92xg7Vg7gQuXRKbe8iX0IFt/l2GibeAkcV34zcoVyIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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