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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96b502d0b4f0dd3987d64e1bdd7cad456eb06de9128c2e73eb7abb09b3b6e8b' 
  AND token = 'S6itGV4ILVK4XDiqeRzL++RvVu3Oc4ha30uF2rmpbnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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