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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7c3b0851e5be3c4bc19de4d060681dedb4e957c4b31b1e9d407996965ce64c' 
  AND token = 'W49RhIzpncNLCaLShfsESBnnbaWIaRnnJ3x99b/UvrE=' 
  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"
    }
  }
}