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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e74311839e79f2e6f58b89cd7ee4b7f11e10b409dd81fb6a8219f0b2fd147c' 
  AND token = 'LJMPWfssKOrFkwAPbxXQA/OZAuk+OPIldao0QFo+5Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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