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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28ed8539428dee969c9611595add689cde276ceccd4c8eeab3fcf9e734a904e' 
  AND token = 'zA24Iohc0Rr8gmkKNYVanP0eqtQERB6uD3YxUngxOhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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