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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5c4dc50d5947b2182a2814203b50ff6a57cd36eac674210829e5d193dcd954' 
  AND token = '8prOfvtZSB2BuKiR5VODgSMfTckdrcf151rMqUIRO0s=' 
  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"
    }
  }
}