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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a73d2222b7f68a5943a22b86934b0da8100064dd41d64a7e2e39d6d089b8a6b' 
  AND token = 'W/UuuKux+F0mUlt/S4Hr8yhzR/SudacfCa2FfH4EuaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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