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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d564c323273d39c453817c06dd9e32dc66da1f6e39a662915a3c389e07533d' 
  AND token = 'UREr/5HfXn0qJ5aPE7fmURkf1R/vrP55Qcf2Qwe1Vd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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