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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871704c76597d5b928b0d059d5e5cc34a9259e8e5aa53497426c4cc19a77d460' 
  AND token = '0ARGe3HMSiU5G+Y/rHCD2G9G1ZUvr3Q2EWWR281nF90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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