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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f5ae8edaea9d9cf54f0c3df92314c10bc9ea40a8a9ca7f8e3ae34d220d260d' 
  AND token = 'gq/DYxf+Aa2nRqd5uSkOhL1lVuJO+1OxhnQC94Dukl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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