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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d91cdc811fa10b48bfc58a330fee0032df8f18e30b5c312c39a240f74365cc6' 
  AND token = '6OoJ2ynnfA9Wo8muYBpE8rs/pmpd592lam/qfSHFvZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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