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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f4fa296c5ba1a4b370e01a2d3ac98a93af3eefc551335208a53f0d4c2d7375' 
  AND token = 'ax+Hbb48VzwYZpDwZRcmLWmKkOCkQGOTqowjD3LI3LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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