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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e70aee7564541dfd57988b1f82ed73c94377ef35be3094d2989768873dd574' 
  AND token = 'U8BrpA7S/0/HiY5VTMZeD275Kz0WTcysavOGiudTU9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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