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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8f8cbd7741490c3286957865646701228f83d6b687c9d648af53829bc33631' 
  AND token = 'a93XlSw+9kYhAWIsxv9mNrwsudnIS9qC+4VFIh7f6ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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