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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c6ed65ce71c3d4dab9f9fb75f9b547570ca39de97aae7bec061ea38939e6a9' 
  AND token = 'vASAgv7ORvS+JE5pZGcU1ksFVOHdRIpng2aK7+2C+lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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