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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0327009f0d90d98206098d85c9d215ca416014b4cf528094ffe90a5cae0935' 
  AND token = 'GDWFDyA/I2URTep3/d2nPV+ZN+kPL3oCfTp/Rihfpn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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