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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09256b87443d71244c8be68c5fcb708019115346e127bd720f2427fb28c425af' 
  AND token = 'f6PtR0piOtwWH/KFtAz50QfGma66PnOuy/lYGv/W9Y4=' 
  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"
    }
  }
}