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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dc628010c9e4c520a5c5a48f3aee6b4a764ae2f1e87e29663d3da914bed95d' 
  AND token = 'C5mUZRgCuSbE32pO3hOtgf1GVMvlNj68Mf/c0Nn6wuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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