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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dae5e9098d26d26d36025341e9a51c8a6f20b44f7388178e28fcd2db093e48' 
  AND token = 'GS+4T1MCRBniREKg4bU+Fx86iv+3iwsyi1w81/zbgFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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