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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94c1e7711ab7a32d10b4420a6009b140364d6e251cf7ee37d97657d4af691b5' 
  AND token = '9zIN28xuV5mWaVnGR61f7drnx7pSBFQb2t6i3+kAd28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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