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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904535d8aec3bc93e72910ef796d1cd7a53f4e55ad6597b72c0c0f61c852ca06' 
  AND token = 'HPuQpkBx3C2IYIzb7CX2W/ext3JapTp5Nk6j4jdDFJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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