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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f1ae8fa406ea5e23516cd8e1cd792621dd98016071361936151b850b1e452d' 
  AND token = 'HpppNn7YN3AO3eqHRBV4Yv24d1VPal2LxL2KoRyO4FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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