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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24d9c3c576c117a7759fed331b27b08e96550ebacf62aef6a5802da3a65b39c' 
  AND token = 'jPp0sTd1TuVRQ6amC4rXi3507jQEut5+izWwzEHz1Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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