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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677a98e15edfdbb61d578ce0fc24e12e8c8eed3a6a0987ef9541928be20e66e1' 
  AND token = 'OeM1Mm0LZWbLV86UQY1Gr5NJWptbatCxMy10QU0DTmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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