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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee042e46907308f9fa49749b64f5154ba6b3547753acd1c1816395e3f3e6af2' 
  AND token = 'Amx4M9b7G8uZeU7Lzkl5a4xYd1F9OoLO9DzdITv71Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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