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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632b3d42352453ea6e8daa22aa37240ac0127e3bf01dba82c7e3c2e5c5f817d8' 
  AND token = '/kasVcB0RXiqWadmj+DPVyeXnAyine5tOAVpviJ3QBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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