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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ce590b643ad3106e5edf49f9fef19cf0236e43d3d950dac0b59ecc593f19b5' 
  AND token = '/YPL/EzE8/Wqq2BbgHX2hWRqIhjqhG7zR3ET5sooNh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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