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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cabc2aabec201fae20087317e1b1271f42843d8899db07f882b9b4814b301a' 
  AND token = 'vyZl2q2ET/W9qEP1r6aMATb5WiGqzFrTmyTCh1wRwiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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