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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0ea4b7a26793dd79d3f459806f54647aa800a8e67a913e151495454dcb8e43' 
  AND token = '4vn5cFgniX2JSP++M46AysvDJfucYpl3+bC6/H+8NPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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