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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515e0054f70c0682f327f8c07f1c9df94a20ca3e247f6febcf22b92a5f4d37a8' 
  AND token = '6OcaSBgPVSUP51O49h9IVIZluxVV9CYTBTeuznQzea4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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