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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb25c9062a740da48ef79a72aefb7da470fcb952f9fa6ed3f3cd008b023f32d' 
  AND token = 'oh40eORutYZUxRiMbtRsyLKX8SyyLEM2+3q+USFafKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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