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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dbb5356605281af10e9d13d4c37b4d9a302db676bb3aeb504815da017e8c24' 
  AND token = 'aFQ3tIDypUne5KIYZdgnmUd3bgp78GrqgvLO1gECag4=' 
  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"
    }
  }
}