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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7fd7d9edf612f0bcac5a7718a3ab780e872d573bad02c7cb1a5c048636ed74' 
  AND token = 'dkNxR2+2LtXik1Y2FCT54Zem84837t8HHcnBGh9eH30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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