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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5d538b8990acf94ff31fb55f83ad9b52ecd72e4961e48d79be97e37d18b6b1' 
  AND token = 'oI9pTp7H+/qq9FIK0d0QWbDX9eSQGh24xI5O/M2AkwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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