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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74df2dea7fab1b19ed5732b22a7ca9131565df708403c85005ab9225176f19e8' 
  AND token = '0bYzzRDx3sMz2Tvpw06X0ZnlX5EFhg3spAT61necjqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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