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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f1b1bab3979f2ebf936dee06da5858c33ab7e4223274dec402a08f78b9268e' 
  AND token = 'I1FjHhrHGBMc98vADn13X+Nffst574K0vbIEFEOYUEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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